The Net Advance of Physics:
History and Philosophy:
Kristian Birkeland

The Norwegian Aurora Polaris Expedition 1902-1903
by Kristian Birkeland
[Christiana: Aschehoug, 1908] Only the first part of Volume I seems to have been placed in the Archive,
which is extraordinarily unfortunate, since Birkeland's most important
contribution to science is found in the second part!